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With what velocity must an electron trav...

With what velocity must an electron travel so that its momentum is equal to that of a photon fo wavelength of `lamda=5200Å` ?

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The correct Answer is:
1400 m/sec
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de-Broglie proposed dual natrue for elecrton by putting his famous equation lambda = ( lambda) /( mu) , Later on Heisenberg proposed uncertiainty principle as . Deltap.Deltaxle(h)/(2)(h=(h)/(2pi)) . On the contray particel natrue of electron wa estabilshed on the basis fo photoelectric effect . When a photon strikes the metal suface it given up its energy to the electro . Part of this enrgy ( say W) is used by the electrons to escpe form the metal and the remaining imparts he kinetc enrgy (1//2 mu^2) to photoeleton . The potential applied on the surface to reduce the velocity fo photoelecton to zero is known as stoppong potential . With what velocity must an electon travel so that its momentum is equal to that of photon fo wavelength of lambda = 5200Å ?

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